hw/usb/bus.c

   1 #include "qemu/osdep.h"
   2 #include "hw/qdev-properties.h"
   3 #include "hw/usb.h"
   4 #include "qapi/error.h"
   5 #include "qemu/error-report.h"
   6 #include "qemu/module.h"
   7 #include "sysemu/sysemu.h"
   8 #include "migration/vmstate.h"
   9 #include "monitor/monitor.h"
  10 #include "trace.h"
  11 #include "qemu/cutils.h"
  12
  13 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
  14
  15 static char *usb_get_dev_path(DeviceState *dev);
  16 static char *usb_get_fw_dev_path(DeviceState *qdev);
  17 static void usb_qdev_unrealize(DeviceState *qdev);
  18
  19 static Property usb_props[] = {
  20     DEFINE_PROP_STRING("port", USBDevice, port_path),
  21     DEFINE_PROP_STRING("serial", USBDevice, serial),
  22     DEFINE_PROP_BIT("full-path", USBDevice, flags,
  23                     USB_DEV_FLAG_FULL_PATH, true),
  24     DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
  25                     USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
  26     DEFINE_PROP_END_OF_LIST()
  27 };
  28
  29 static void usb_bus_class_init(ObjectClass *klass, void *data)
  30 {
  31     BusClass *k = BUS_CLASS(klass);
  32     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
  33
  34     k->print_dev = usb_bus_dev_print;
  35     k->get_dev_path = usb_get_dev_path;
  36     k->get_fw_dev_path = usb_get_fw_dev_path;
  37     hc->unplug = qdev_simple_device_unplug_cb;
  38 }
  39
  40 static const TypeInfo usb_bus_info = {
  41     .name = TYPE_USB_BUS,
  42     .parent = TYPE_BUS,
  43     .instance_size = sizeof(USBBus),
  44     .class_init = usb_bus_class_init,
  45     .interfaces = (InterfaceInfo[]) {
  46         { TYPE_HOTPLUG_HANDLER },
  47         { }
  48     }
  49 };
  50
  51 static int next_usb_bus = 0;
  52 static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
  53
  54 static int usb_device_post_load(void *opaque, int version_id)
  55 {
  56     USBDevice *dev = opaque;
  57
  58     if (dev->state == USB_STATE_NOTATTACHED) {
  59         dev->attached = false;
  60     } else {
  61         dev->attached = true;
  62     }
  63     return 0;
  64 }
  65
  66 const VMStateDescription vmstate_usb_device = {
  67     .name = "USBDevice",
  68     .version_id = 1,
  69     .minimum_version_id = 1,
  70     .post_load = usb_device_post_load,
  71     .fields = (VMStateField[]) {
  72         VMSTATE_UINT8(addr, USBDevice),
  73         VMSTATE_INT32(state, USBDevice),
  74         VMSTATE_INT32(remote_wakeup, USBDevice),
  75         VMSTATE_INT32(setup_state, USBDevice),
  76         VMSTATE_INT32(setup_len, USBDevice),
  77         VMSTATE_INT32(setup_index, USBDevice),
  78         VMSTATE_UINT8_ARRAY(setup_buf, USBDevice, 8),
  79         VMSTATE_END_OF_LIST(),
  80     }
  81 };
  82
  83 void usb_bus_new(USBBus *bus, size_t bus_size,
  84                  USBBusOps *ops, DeviceState *host)
  85 {
  86     qbus_create_inplace(bus, bus_size, TYPE_USB_BUS, host, NULL);
  87     qbus_set_bus_hotplug_handler(BUS(bus), &error_abort);
  88     bus->ops = ops;
  89     bus->busnr = next_usb_bus++;
  90     QTAILQ_INIT(&bus->free);
  91     QTAILQ_INIT(&bus->used);
  92     QTAILQ_INSERT_TAIL(&busses, bus, next);
  93 }
  94
  95 void usb_bus_release(USBBus *bus)
  96 {
  97     assert(next_usb_bus > 0);
  98
  99     QTAILQ_REMOVE(&busses, bus, next);
 100 }
 101
 102 USBBus *usb_bus_find(int busnr)
 103 {
 104     USBBus *bus;
 105
 106     if (-1 == busnr)
 107         return QTAILQ_FIRST(&busses);
 108     QTAILQ_FOREACH(bus, &busses, next) {
 109         if (bus->busnr == busnr)
 110             return bus;
 111     }
 112     return NULL;
 113 }
 114
 115 static void usb_device_realize(USBDevice *dev, Error **errp)
 116 {
 117     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 118
 119     if (klass->realize) {
 120         klass->realize(dev, errp);
 121     }
 122 }
 123
 124 USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
 125 {
 126     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 127     if (klass->find_device) {
 128         return klass->find_device(dev, addr);
 129     }
 130     return NULL;
 131 }
 132
 133 static void usb_device_unrealize(USBDevice *dev)
 134 {
 135     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 136
 137     if (klass->unrealize) {
 138         klass->unrealize(dev);
 139     }
 140 }
 141
 142 void usb_device_cancel_packet(USBDevice *dev, USBPacket *p)
 143 {
 144     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 145     if (klass->cancel_packet) {
 146         klass->cancel_packet(dev, p);
 147     }
 148 }
 149
 150 void usb_device_handle_attach(USBDevice *dev)
 151 {
 152     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 153     if (klass->handle_attach) {
 154         klass->handle_attach(dev);
 155     }
 156 }
 157
 158 void usb_device_handle_reset(USBDevice *dev)
 159 {
 160     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 161     if (klass->handle_reset) {
 162         klass->handle_reset(dev);
 163     }
 164 }
 165
 166 void usb_device_handle_control(USBDevice *dev, USBPacket *p, int request,
 167                                int value, int index, int length, uint8_t *data)
 168 {
 169     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 170     if (klass->handle_control) {
 171         klass->handle_control(dev, p, request, value, index, length, data);
 172     }
 173 }
 174
 175 void usb_device_handle_data(USBDevice *dev, USBPacket *p)
 176 {
 177     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 178     if (klass->handle_data) {
 179         klass->handle_data(dev, p);
 180     }
 181 }
 182
 183 const char *usb_device_get_product_desc(USBDevice *dev)
 184 {
 185     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 186     return klass->product_desc;
 187 }
 188
 189 const USBDesc *usb_device_get_usb_desc(USBDevice *dev)
 190 {
 191     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 192     if (dev->usb_desc) {
 193         return dev->usb_desc;
 194     }
 195     return klass->usb_desc;
 196 }
 197
 198 void usb_device_set_interface(USBDevice *dev, int interface,
 199                               int alt_old, int alt_new)
 200 {
 201     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 202     if (klass->set_interface) {
 203         klass->set_interface(dev, interface, alt_old, alt_new);
 204     }
 205 }
 206
 207 void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
 208 {
 209     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 210     if (klass->flush_ep_queue) {
 211         klass->flush_ep_queue(dev, ep);
 212     }
 213 }
 214
 215 void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
 216 {
 217     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 218     if (klass->ep_stopped) {
 219         klass->ep_stopped(dev, ep);
 220     }
 221 }
 222
 223 int usb_device_alloc_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps,
 224                              int streams)
 225 {
 226     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 227     if (klass->alloc_streams) {
 228         return klass->alloc_streams(dev, eps, nr_eps, streams);
 229     }
 230     return 0;
 231 }
 232
 233 void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
 234 {
 235     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 236     if (klass->free_streams) {
 237         klass->free_streams(dev, eps, nr_eps);
 238     }
 239 }
 240
 241 static void usb_qdev_realize(DeviceState *qdev, Error **errp)
 242 {
 243     USBDevice *dev = USB_DEVICE(qdev);
 244     Error *local_err = NULL;
 245
 246     pstrcpy(dev->product_desc, sizeof(dev->product_desc),
 247             usb_device_get_product_desc(dev));
 248     dev->auto_attach = 1;
 249     QLIST_INIT(&dev->strings);
 250     usb_ep_init(dev);
 251
 252     usb_claim_port(dev, &local_err);
 253     if (local_err) {
 254         error_propagate(errp, local_err);
 255         return;
 256     }
 257
 258     usb_device_realize(dev, &local_err);
 259     if (local_err) {
 260         usb_release_port(dev);
 261         error_propagate(errp, local_err);
 262         return;
 263     }
 264
 265     if (dev->auto_attach) {
 266         usb_device_attach(dev, &local_err);
 267         if (local_err) {
 268             usb_qdev_unrealize(qdev);
 269             error_propagate(errp, local_err);
 270             return;
 271         }
 272     }
 273 }
 274
 275 static void usb_qdev_unrealize(DeviceState *qdev)
 276 {
 277     USBDevice *dev = USB_DEVICE(qdev);
 278     USBDescString *s, *next;
 279
 280     QLIST_FOREACH_SAFE(s, &dev->strings, next, next) {
 281         QLIST_REMOVE(s, next);
 282         g_free(s->str);
 283         g_free(s);
 284     }
 285
 286     if (dev->attached) {
 287         usb_device_detach(dev);
 288     }
 289     usb_device_unrealize(dev);
 290     if (dev->port) {
 291         usb_release_port(dev);
 292     }
 293 }
 294
 295 typedef struct LegacyUSBFactory
 296 {
 297     const char *name;
 298     const char *usbdevice_name;
 299     USBDevice *(*usbdevice_init)(const char *params);
 300 } LegacyUSBFactory;
 301
 302 static GSList *legacy_usb_factory;
 303
 304 void usb_legacy_register(const char *typename, const char *usbdevice_name,
 305                          USBDevice *(*usbdevice_init)(const char *params))
 306 {
 307     if (usbdevice_name) {
 308         LegacyUSBFactory *f = g_malloc0(sizeof(*f));
 309         f->name = typename;
 310         f->usbdevice_name = usbdevice_name;
 311         f->usbdevice_init = usbdevice_init;
 312         legacy_usb_factory = g_slist_append(legacy_usb_factory, f);
 313     }
 314 }
 315
 316 USBDevice *usb_new(const char *name)
 317 {
 318     return USB_DEVICE(qdev_new(name));
 319 }
 320
 321 bool usb_realize_and_unref(USBDevice *dev, USBBus *bus, Error **errp)
 322 {
 323     return qdev_realize_and_unref(&dev->qdev, &bus->qbus, errp);
 324 }
 325
 326 static USBDevice *usb_try_create_simple(USBBus *bus, const char *name,
 327                                         Error **errp)
 328 {
 329     Error *err = NULL;
 330     DeviceState *dev;
 331
 332     dev = qdev_try_new(name);
 333     if (!dev) {
 334         error_setg(errp, "Failed to create USB device '%s'", name);
 335         return NULL;
 336     }
 337     qdev_realize_and_unref(dev, &bus->qbus, &err);
 338     if (err) {
 339         error_propagate_prepend(errp, err,
 340                                 "Failed to initialize USB device '%s': ",
 341                                 name);
 342         return NULL;
 343     }
 344     return USB_DEVICE(dev);
 345 }
 346
 347 USBDevice *usb_create_simple(USBBus *bus, const char *name)
 348 {
 349     return usb_try_create_simple(bus, name, &error_abort);
 350 }
 351
 352 static void usb_fill_port(USBPort *port, void *opaque, int index,
 353                           USBPortOps *ops, int speedmask)
 354 {
 355     port->opaque = opaque;
 356     port->index = index;
 357     port->ops = ops;
 358     port->speedmask = speedmask;
 359     usb_port_location(port, NULL, index + 1);
 360 }
 361
 362 void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
 363                        USBPortOps *ops, int speedmask)
 364 {
 365     usb_fill_port(port, opaque, index, ops, speedmask);
 366     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 367     bus->nfree++;
 368 }
 369
 370 void usb_register_companion(const char *masterbus, USBPort *ports[],
 371                             uint32_t portcount, uint32_t firstport,
 372                             void *opaque, USBPortOps *ops, int speedmask,
 373                             Error **errp)
 374 {
 375     USBBus *bus;
 376     int i;
 377
 378     QTAILQ_FOREACH(bus, &busses, next) {
 379         if (strcmp(bus->qbus.name, masterbus) == 0) {
 380             break;
 381         }
 382     }
 383
 384     if (!bus) {
 385         error_setg(errp, "USB bus '%s' not found", masterbus);
 386         return;
 387     }
 388     if (!bus->ops->register_companion) {
 389         error_setg(errp, "Can't use USB bus '%s' as masterbus,"
 390                    " it doesn't support companion controllers",
 391                    masterbus);
 392         return;
 393     }
 394
 395     for (i = 0; i < portcount; i++) {
 396         usb_fill_port(ports[i], opaque, i, ops, speedmask);
 397     }
 398
 399     bus->ops->register_companion(bus, ports, portcount, firstport, errp);
 400 }
 401
 402 void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
 403 {
 404     if (upstream) {
 405         int l = snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
 406                          upstream->path, portnr);
 407         /* Max string is nn.nn.nn.nn.nn, which fits in 16 bytes */
 408         assert(l < sizeof(downstream->path));
 409         downstream->hubcount = upstream->hubcount + 1;
 410     } else {
 411         snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
 412         downstream->hubcount = 0;
 413     }
 414 }
 415
 416 void usb_unregister_port(USBBus *bus, USBPort *port)
 417 {
 418     if (port->dev) {
 419         object_unparent(OBJECT(port->dev));
 420     }
 421     QTAILQ_REMOVE(&bus->free, port, next);
 422     bus->nfree--;
 423 }
 424
 425 void usb_claim_port(USBDevice *dev, Error **errp)
 426 {
 427     USBBus *bus = usb_bus_from_device(dev);
 428     USBPort *port;
 429
 430     assert(dev->port == NULL);
 431
 432     if (dev->port_path) {
 433         QTAILQ_FOREACH(port, &bus->free, next) {
 434             if (strcmp(port->path, dev->port_path) == 0) {
 435                 break;
 436             }
 437         }
 438         if (port == NULL) {
 439             error_setg(errp, "usb port %s (bus %s) not found (in use?)",
 440                        dev->port_path, bus->qbus.name);
 441             return;
 442         }
 443     } else {
 444         if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
 445             /* Create a new hub and chain it on */
 446             usb_try_create_simple(bus, "usb-hub", NULL);
 447         }
 448         if (bus->nfree == 0) {
 449             error_setg(errp, "tried to attach usb device %s to a bus "
 450                        "with no free ports", dev->product_desc);
 451             return;
 452         }
 453         port = QTAILQ_FIRST(&bus->free);
 454     }
 455     trace_usb_port_claim(bus->busnr, port->path);
 456
 457     QTAILQ_REMOVE(&bus->free, port, next);
 458     bus->nfree--;
 459
 460     dev->port = port;
 461     port->dev = dev;
 462
 463     QTAILQ_INSERT_TAIL(&bus->used, port, next);
 464     bus->nused++;
 465 }
 466
 467 void usb_release_port(USBDevice *dev)
 468 {
 469     USBBus *bus = usb_bus_from_device(dev);
 470     USBPort *port = dev->port;
 471
 472     assert(port != NULL);
 473     trace_usb_port_release(bus->busnr, port->path);
 474
 475     QTAILQ_REMOVE(&bus->used, port, next);
 476     bus->nused--;
 477
 478     dev->port = NULL;
 479     port->dev = NULL;
 480
 481     QTAILQ_INSERT_TAIL(&bus->free, port, next);
 482     bus->nfree++;
 483 }
 484
 485 static void usb_mask_to_str(char *dest, size_t size,
 486                             unsigned int speedmask)
 487 {
 488     static const struct {
 489         unsigned int mask;
 490         const char *name;
 491     } speeds[] = {
 492         { .mask = USB_SPEED_MASK_FULL,  .name = "full"  },
 493         { .mask = USB_SPEED_MASK_HIGH,  .name = "high"  },
 494         { .mask = USB_SPEED_MASK_SUPER, .name = "super" },
 495     };
 496     int i, pos = 0;
 497
 498     for (i = 0; i < ARRAY_SIZE(speeds); i++) {
 499         if (speeds[i].mask & speedmask) {
 500             pos += snprintf(dest + pos, size - pos, "%s%s",
 501                             pos ? "+" : "",
 502                             speeds[i].name);
 503         }
 504     }
 505
 506     if (pos == 0) {
 507         snprintf(dest, size, "unknown");
 508     }
 509 }
 510
 511 void usb_check_attach(USBDevice *dev, Error **errp)
 512 {
 513     USBBus *bus = usb_bus_from_device(dev);
 514     USBPort *port = dev->port;
 515     char devspeed[32], portspeed[32];
 516
 517     assert(port != NULL);
 518     assert(!dev->attached);
 519     usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
 520     usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
 521     trace_usb_port_attach(bus->busnr, port->path,
 522                           devspeed, portspeed);
 523
 524     if (!(port->speedmask & dev->speedmask)) {
 525         error_setg(errp, "Warning: speed mismatch trying to attach"
 526                    " usb device \"%s\" (%s speed)"
 527                    " to bus \"%s\", port \"%s\" (%s speed)",
 528                    dev->product_desc, devspeed,
 529                    bus->qbus.name, port->path, portspeed);
 530         return;
 531     }
 532 }
 533
 534 void usb_device_attach(USBDevice *dev, Error **errp)
 535 {
 536     USBPort *port = dev->port;
 537     Error *local_err = NULL;
 538
 539     usb_check_attach(dev, &local_err);
 540     if (local_err) {
 541         error_propagate(errp, local_err);
 542         return;
 543     }
 544
 545     dev->attached = true;
 546     usb_attach(port);
 547 }
 548
 549 int usb_device_detach(USBDevice *dev)
 550 {
 551     USBBus *bus = usb_bus_from_device(dev);
 552     USBPort *port = dev->port;
 553
 554     assert(port != NULL);
 555     assert(dev->attached);
 556     trace_usb_port_detach(bus->busnr, port->path);
 557
 558     usb_detach(port);
 559     dev->attached = false;
 560     return 0;
 561 }
 562
 563 static const char *usb_speed(unsigned int speed)
 564 {
 565     static const char *txt[] = {
 566         [ USB_SPEED_LOW  ] = "1.5",
 567         [ USB_SPEED_FULL ] = "12",
 568         [ USB_SPEED_HIGH ] = "480",
 569         [ USB_SPEED_SUPER ] = "5000",
 570     };
 571     if (speed >= ARRAY_SIZE(txt))
 572         return "?";
 573     return txt[speed];
 574 }
 575
 576 static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
 577 {
 578     USBDevice *dev = USB_DEVICE(qdev);
 579     USBBus *bus = usb_bus_from_device(dev);
 580
 581     monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
 582                    indent, "", bus->busnr, dev->addr,
 583                    dev->port ? dev->port->path : "-",
 584                    usb_speed(dev->speed), dev->product_desc,
 585                    dev->attached ? ", attached" : "");
 586 }
 587
 588 static char *usb_get_dev_path(DeviceState *qdev)
 589 {
 590     USBDevice *dev = USB_DEVICE(qdev);
 591     DeviceState *hcd = qdev->parent_bus->parent;
 592     char *id = NULL;
 593
 594     if (dev->flags & (1 << USB_DEV_FLAG_FULL_PATH)) {
 595         id = qdev_get_dev_path(hcd);
 596     }
 597     if (id) {
 598         char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
 599         g_free(id);
 600         return ret;
 601     } else {
 602         return g_strdup(dev->port->path);
 603     }
 604 }
 605
 606 static char *usb_get_fw_dev_path(DeviceState *qdev)
 607 {
 608     USBDevice *dev = USB_DEVICE(qdev);
 609     char *fw_path, *in;
 610     ssize_t pos = 0, fw_len;
 611     long nr;
 612
 613     fw_len = 32 + strlen(dev->port->path) * 6;
 614     fw_path = g_malloc(fw_len);
 615     in = dev->port->path;
 616     while (fw_len - pos > 0) {
 617         nr = strtol(in, &in, 10);
 618         if (in[0] == '.') {
 619             /* some hub between root port and device */
 620             pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
 621             in++;
 622         } else {
 623             /* the device itself */
 624             pos += snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
 625                             qdev_fw_name(qdev), nr);
 626             break;
 627         }
 628     }
 629     return fw_path;
 630 }
 631
 632 void hmp_info_usb(Monitor *mon, const QDict *qdict)
 633 {
 634     USBBus *bus;
 635     USBDevice *dev;
 636     USBPort *port;
 637
 638     if (QTAILQ_EMPTY(&busses)) {
 639         monitor_printf(mon, "USB support not enabled\n");
 640         return;
 641     }
 642
 643     QTAILQ_FOREACH(bus, &busses, next) {
 644         QTAILQ_FOREACH(port, &bus->used, next) {
 645             dev = port->dev;
 646             if (!dev)
 647                 continue;
 648             monitor_printf(mon, "  Device %d.%d, Port %s, Speed %s Mb/s, "
 649                            "Product %s%s%s\n",
 650                            bus->busnr, dev->addr, port->path,
 651                            usb_speed(dev->speed), dev->product_desc,
 652                            dev->qdev.id ? ", ID: " : "",
 653                            dev->qdev.id ?: "");
 654         }
 655     }
 656 }
 657
 658 /* handle legacy -usbdevice cmd line option */
 659 USBDevice *usbdevice_create(const char *cmdline)
 660 {
 661     USBBus *bus = usb_bus_find(-1 /* any */);
 662     LegacyUSBFactory *f = NULL;
 663     Error *err = NULL;
 664     GSList *i;
 665     char driver[32];
 666     const char *params;
 667     int len;
 668     USBDevice *dev;
 669
 670     params = strchr(cmdline,':');
 671     if (params) {
 672         params++;
 673         len = params - cmdline;
 674         if (len > sizeof(driver))
 675             len = sizeof(driver);
 676         pstrcpy(driver, len, cmdline);
 677     } else {
 678         params = "";
 679         pstrcpy(driver, sizeof(driver), cmdline);
 680     }
 681
 682     for (i = legacy_usb_factory; i; i = i->next) {
 683         f = i->data;
 684         if (strcmp(f->usbdevice_name, driver) == 0) {
 685             break;
 686         }
 687     }
 688     if (i == NULL) {
 689 #if 0
 690         /* no error because some drivers are not converted (yet) */
 691         error_report("usbdevice %s not found", driver);
 692 #endif
 693         return NULL;
 694     }
 695
 696     if (!bus) {
 697         error_report("Error: no usb bus to attach usbdevice %s, "
 698                      "please try -machine usb=on and check that "
 699                      "the machine model supports USB", driver);
 700         return NULL;
 701     }
 702
 703     if (f->usbdevice_init) {
 704         dev = f->usbdevice_init(params);
 705     } else {
 706         if (*params) {
 707             error_report("usbdevice %s accepts no params", driver);
 708             return NULL;
 709         }
 710         dev = usb_new(f->name);
 711     }
 712     if (!dev) {
 713         error_report("Failed to create USB device '%s'", f->name);
 714         return NULL;
 715     }
 716     usb_realize_and_unref(dev, bus, &err);
 717     if (err) {
 718         error_reportf_err(err, "Failed to initialize USB device '%s': ",
 719                           f->name);
 720         object_unparent(OBJECT(dev));
 721         return NULL;
 722     }
 723     return dev;
 724 }
 725
 726 static bool usb_get_attached(Object *obj, Error **errp)
 727 {
 728     USBDevice *dev = USB_DEVICE(obj);
 729
 730     return dev->attached;
 731 }
 732
 733 static void usb_set_attached(Object *obj, bool value, Error **errp)
 734 {
 735     USBDevice *dev = USB_DEVICE(obj);
 736     Error *err = NULL;
 737
 738     if (dev->attached == value) {
 739         return;
 740     }
 741
 742     if (value) {
 743         usb_device_attach(dev, &err);
 744         error_propagate(errp, err);
 745     } else {
 746         usb_device_detach(dev);
 747     }
 748 }
 749
 750 static void usb_device_instance_init(Object *obj)
 751 {
 752     USBDevice *dev = USB_DEVICE(obj);
 753     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
 754
 755     if (klass->attached_settable) {
 756         object_property_add_bool(obj, "attached",
 757                                  usb_get_attached, usb_set_attached);
 758     } else {
 759         object_property_add_bool(obj, "attached",
 760                                  usb_get_attached, NULL);
 761     }
 762 }
 763
 764 static void usb_device_class_init(ObjectClass *klass, void *data)
 765 {
 766     DeviceClass *k = DEVICE_CLASS(klass);
 767     k->bus_type = TYPE_USB_BUS;
 768     k->realize  = usb_qdev_realize;
 769     k->unrealize = usb_qdev_unrealize;
 770     device_class_set_props(k, usb_props);
 771 }
 772
 773 static const TypeInfo usb_device_type_info = {
 774     .name = TYPE_USB_DEVICE,
 775     .parent = TYPE_DEVICE,
 776     .instance_size = sizeof(USBDevice),
 777     .instance_init = usb_device_instance_init,
 778     .abstract = true,
 779     .class_size = sizeof(USBDeviceClass),
 780     .class_init = usb_device_class_init,
 781 };
 782
 783 static void usb_register_types(void)
 784 {
 785     type_register_static(&usb_bus_info);
 786     type_register_static(&usb_device_type_info);
 787 }
 788
 789 type_init(usb_register_types)